Flow Noise Damping Sleeve Seal for Thermal Expansion Stability
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Solution Overview
Problem
Existing devices for reducing flow noise, such as those used in exhaust gas turbochargers, face issues with inadequate sealing and frequency changes due to temperature fluctuations and material expansion differences, leading to unwanted changes in damping properties.
Innovation Solution
A sealing ring made from a knitted wire fabric or silicate fibers is used, providing high temperature resistance and elastic properties to ensure a secure seal across varying temperatures and material expansions, with a cap-like design that easily bridges gaps between the radial collar and sleeves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional sealing ring made of elastomer is used, then the sealing function is provided, but the sealing properties change undesirably due to temperature fluctuations
Solution Approach 1:
The sealing ring material is changed from elastomer to wire knit or silicate fiber knit, fundamentally altering the material parameters to achieve high temperature resistance while maintaining sealing functionality through the elastic properties of the knit structure
Solution Approach 2:
The use of wire knit or silicate fiber knit represents a composite material approach, combining different materials (wire or silicate fibers) to create a sealing ring that withstands high temperatures while maintaining elastic sealing properties
2Adaptability or versatility
If different materials with different coefficients of expansion are used for outer sleeve and inner sleeve, then structural requirements are met, but inadequate sealing occurs due to tolerance variations and thermal expansion differences
Solution Approach 1:
The sealing ring utilizes a flexible knit structure (wire knit or silicate fiber knit) that can deform and adapt to dimensional changes caused by thermal expansion differences between materials, maintaining effective sealing despite tolerance variations and differential expansion
Solution Approach 2:
The invention accounts for thermal expansion by using a sealing ring material that can accommodate expansion differences between the outer and inner sleeves, with the elastic knit structure adapting to dimensional changes while maintaining sealing contact
3Ease of manufacture
If the radial collar does not sufficiently separate or seal the chambers, then manufacturing is simpler, but frequency changes and damping property changes occur
Solution Approach 1:
The sealing ring acts as an intermediary element between the radial collar and the sleeves, providing the necessary sealing function without requiring the collar itself to be precisely manufactured, thus maintaining manufacturing simplicity while achieving precise chamber separation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively maintains a reliable seal across temperature fluctuations and material expansion differences, reducing unwanted frequency changes and enhancing the durability and efficiency of flow noise reduction devices.
Implementation Method 1
A sealing ring made from a knitted wire fabric or silicate fibers is used, providing high temperature resistance and elastic properties to ensure a secure seal
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a device (1, 1', 1'') for lowering flow noises, comprising a first connection piece (2, 2'), a second connection piece (3, 3') facing away from the first connection piece (2, 2'), an outer sleeve (4, 4') arranged between the first connection piece (2, 2') and the second connection piece (3, 3'), and an inner sleeve (5, 5') arranged between the connection pieces (2, 2', 3, 3'), wherein at least two volume chambers (7, 7', 8, 8', 9, 9', 10, 10') separated from each other by at least one peripherally extending radial collar (6, 6') are arranged between the inner sleeve (5, 5') and the outer sleeve (4, 4'), which volume chambers are connected to the line space (13, 13') enclosed by the inner sleeve (5, 5') by means of openings (11, 11') in the wall (12, 12') of the inner sleeve (5, 5'), wherein the radial collar (6, 6') has a sealing ring (15, 15', 15'') at the free end (14, 14') of the radial collar. The invention is characterized in that the sealing ring (15, 15', 15'') is designed as a ring cap, which reaches over the collar (6, 6') and lies against a wall surface (22, 35) of the sleeve (4, 4', 5, 5') adjacent to the free end (14, 14') of the collar (6, 6') in a sealing manner by means of a peripherally extending outer lateral surface (21, 21'') of the ring cap and against the end face (25, 25') of the free end (14, 14') of the collar (6, 6') in a sealing manner by means of the inner lateral surface (23, 23'') of the sealing ring facing away from the outer lateral surface (21, 21'') or lies against the side surface (28) of the collar (6, 6') facing the ring cap in a sealing manner by means of an annular radial contact surface (26, 26'') extending parallel to the radial collar (6, 6').